package com.atguigu.chapter01

object Test01 {
  def main(args: Array[String]): Unit = {
    val a: Int = 10
    var b: Int = 20
    //a = 20
    b = 30
    val c = 30
    //c = "30"
    //val d1: Int = _
    val hello = "hello"
    val str: String = "hello"+"scala"

    
  }

}
